Side wall pilot



Patented Apr. 18, 1944 smn ALL'rILo'r James L. Breese, Santa Fe, N.Mex., asslgnor to' Oil Devices, Santa Fe, N. Mex a limited partnershipof Illinois Application August 8,;1941, Serial No. 405,920

5 Claims. (Cl. 158-91) This invention relates to an improvement in pottype burners for liquid fuels, and has for one purpose the provision ofan improved pilot means for providing a low turndown for pot typeburners.

Another purpose is to provide an improved pilot means which shall beefiicient in use and easily applied and removed.

Another purpose is to provide means for carrying flame to the bottom ofthe pot for ignition.

Other purposes will appear from time to time in the course of thespecification and claims.

The invention is illustrated more or less diagrammatically in theaccompanying drawing wherein:

Fig. 1 is a vertical axial section; and

Fig. 2 is a section on the line 2-2 of Fig. 1.

Like parts are indicated by like symbols throughout the specificationand drawing.

Referring to the drawing, i indicates an outer housing, herein shown inthe form of a drum having an upper extension, or continuation t, whichserves as a combustion chamber. 3 indicates a partition adjacent thebottom of the drum i and having a central air admitting aperture l. 5indicates any suitable supporting means or legs, with ample air gaps abetween them, whereby air may be admitted through the aperture t to thespace within the drum i.

and becomes mixed with the primary air supplied by the primary air inletapertures It. Th s mixture then rises upwardly through the pot andreceives a secondary air supply from the air,

inlets ill, and combustion takes place at or above the level of thesecondary inlets, flame extending up into the combustion chamber at thehigh iire. It is important in this type of burner, however, to providemeans for maintaining a low tumdown or a pilot stage at which stage theamount of heat delivered is small. A pilot structure is provided, whichshall be called a side wall pilot. This structure includes a wall 20,herein shown as generally vertical and fiat and cuttin ed a portion ofthe interior of the pot adjacent the fuel inlet and including the fuelinlet. This wall 20 may terminate short of the bottom of the pot, as atEl, or may be provided with any other suitable means, apertures,notches, or the like, whereby fuel delivered from the nozzle it may flowdownwardly and outwardly into the center of the bottom it. The top ofthe space enclosed between the partition 26 and the adjacent pot wall isfurther cut on by a horizontal wall 22, extending from the upper edge ofthe Y partition 20 to the pot wall. It may be provided l indicates apotsupport herein shown as in r the form of an angle ring secured to theinner face oithe drum 6. ii is a pot having an upper flange t restingupon the ring 7. i0 is any suitable flame ring for the top of the pot,having a central aperture ii.

it is a fuel duct extending from any suitable source of liquid fuelsupply not herein shown. Any suitable meansnot herein shown may beemployed for varying the rate of flow of fuel alon said duct and therebyvarying the height of the fire within the pot. it is any suitable liquidfuel inlet nozzle, the details of which do not of themselves form partof the present invention.

The pot is provided with a generally concave bottom l5,'upon which fuelmay flow to be vaporlzed by the heat of combustion occurring above inthe pot. The wall of the pot is provided with aplurality of air inletapertures i6, located at various levels. Any suitable means may beemployed for delivering a secondary air supp y to the top of the pot.Illustrated for example is a plurality of secondary air inlets II.

In the so-called hydroxylating type bumers, liquid fuel flowing into thepot is vaporized by the heat of combustion taking place in or above thebottom. The vaporized hydrocarbon rises with any suitable aperture orapertures, but an oval aperture 23 is indicated. 2t indicates a lightingtube, which extends from or adjacent the top of the partition 26 to apoint adjacent the bottom of the pot.

In the normal operation of the device, at high fire more fuel isadmitted than can be burned in the pilot chamber. This excess fuel flowsout upon the bottom i5 of the pot, and is vaporized by the heat ofcombustion taking place in the upper portion or above the pot. The levelat which combustion takes place is controlled by varying the supply offuel. When the supply or rate of fuel flow is cut to a minimum, then thevolume of fuel delivered is entirely burned in the pilot area.

The pilot supply of oil is delivered from the nozzle it and may bedropped to the bottom of the pot, andis vaporized by combustion atorabove the top of the pilot area defined by the partitions 2i! and 22.vaporized hydrocarbon mixes with the primary air. supplied by the lowestrow of primary apertures it, part of which row is in communication withthe space within the pilot piece formed by the partitions 20 and 22. Thehydroxylated mixture thus provided flows upwardly. to and through theaperture 23 and receives its secondary supply of air at or above thelevel of the apertures 23 from the air delivered to the interior of thepot as a whole by the primary air inlets i 6. That is to say, these airinlets outside of the pilot area are primary air inlets when theflame'is at the high stage, but provide secondary air for the pilotflame. At the pilot stage all of the fuel supplied is vaporized withinthe pilot area and is burned at or above the top of the pilot structure'A If the rate of flow is increased, the excess oil then begins to flowout into the bottom I5 of the pot. In practice, as the rate of flow isincreased, the level of combustion rises until finally at the high fireall of the inlet apertures iii are effective as primary air inletapertures, and the secondary air supply is received through the inletsI'I.

When the oil spills out under the partition, a certain amount of thevaporized hydrocarbon rises through the tube 24, the end of which isadjacent the flame, which is located at the fuel orifice or aperture 23,and the tube then serves as a lighting or flame carrying tube, whichdirects the flame to light the vaporized hydrocarbon at the bottom ofthe burner adjacent the lower end of the tube.

It will be realized that, whereas a practical and operative device isdescribed and illustrated, nevertheless many changes may be made in thesize, shape, number and disposition of parts without departing from thespirit of the invention. It is therefore wished that the description anddrawing be taken as in a broad sense illustrative or diagrammatic,rather than as a limitation to the precise showing.

What is claimed is:

1. In combination, in a pot type burner, a burner pot having a pluralityof air inlet apertures located at various levels, means for supplyingliquid fuel to the bottom of the pot including a liquid fuel inletmember, and a pilot member, including a partition adapted to cut offfrom the rest of the interior of the pot a space adjacent andsurrounding the fuel inlet member, said partition including an aperturedgenerally horizontal top portion, andsaid partition being spaced fromthe pot bottom to admit liquid fuel from the space within said pilotmember to the bottom of the pot outside of said pilot member, and anopen ended flame tube the top of which is adjacent the apertured topportion of the pilot member and the lower end of which is adjacent thepot bottom.

2. In combination, in a pot type burner, a burner pot having a pluralityof air inlet apertures located at various levels, means for supplyingliquid fuel to the bottom of the pot including a liquid fuel inletmember, and a pilot member, including a partitionadapted to cut oil fromthe rest of the interior of the pot aspace adjacent and surrounding thefuel inlet member, said partition including an apertured generallyhoriis adjacent the apertured top portion of the pilot member and thelower end of which is adjacent the pot bottom, and in communication withthe space in the pot exterior to said pilot member.

3. In combination, in a pot type burner, a burner pot having a pluralityof air inletapertures located at various levels, means for supplyingliquid fuel to the bottom of the pot including a liquid fuel inletmember, and a pilot member, including a partition adapted to cut oiffrom the rest of the interior of the pot a space adjacent andsurrounding the fuel inlet, member, said partition including anapertured generally horizontal top portion, and said partition beingspaced from the pot bottom to admit liquid fuel from the space withinsaid pilot member to the bottom of the pot outside of said pilot member,and an open ended flame tube the top of which is adjacent the aperturedtop portion of the pilot member and the lower end of which is adjacentthe pot bottom, the tube being mounted on the partition.

4. In combination, in a pot type burner, a burner pot having a pluralityof air inlet apertures located at various levels, means for supplyingliquid fuel to the bottom of the Dot including a liquid fuel inletmember, and a pilot member, including a partition adapted to cut offfrom the rest of the interior of the pot a space adjacent andsurrounding the fuel inlet member, and said partition being spaced fromthe pot bottom to admit liquid fuel from the space within said pilotmember to the bottom of the not outside of said pilot member, and anopen ended flame tube the top of which is adjacent the top portion ofthe pilot member and the lower end of which is adjacent the pot bottom.

5. In combination, in a pot type burner, a ,7

burner pot having a circumferential generally cylindrical side wallprovided with a plurality of primary air inlet apertures located atvarious levels in the wall, said pot having a closed bottom and an opentop and a centrally apertured flame ring partially closing the open top,a liquid fuel duct extending to said pot, and in. communication with theinterior of the pot adjacent the bottom thereof, and a pilot memberlocated within the interior of said burner pot and including a generallyvertical wall portion adapted to separate from the rest of the interiorof the ISO zontal top portion, and said partition being spaced from thepot bottom to admit liquidfuel from the space within said pilot memberto the bottom of the pot outside of said pilot member, and an open endedflame tube the top of which pot a limited space of the pot adjacent andsurrounding the point of entry of liquid fuel from the liquid fuel ductand a generally horizontal top wall portion having an aperture therein,said horizontal top wall portion extending from the top of the verticalportion to the adjacent portion of the pot side wall, at a level abovethe level of the lowest of the primary air inlet apertures, saidvertical wall-portion having its lower edge spaced from the bottom ofthe pot, and an open ended flame tube the top of which is adjacent theapertured top wall portion of the pilot member and the lower end ofwhich is adjacent the pot bottom.

JAMES L. BREESE.

